The typsetter now export imposed spreads (print booklet). If I know which page will be on which sheet, I can consider alt bindings, for instance printing one of the sheets on blue paper and stitching it with an offset of an inch.
I introduced a viewport into the program so it can render this offset page. It handles coloring it and offsetting it while designing. When exported to print, the printer will switch out paper color for the given sheet.
Here is an example comparison of digital view and the printed counterpart.